FIGURE 9. Developing human fetal ovaries. At 45 days, the ovary is recognizable only because it has not yet undergone testicular differentiation. In the cortex of the 14-week-old gonad, germ cells are aligned in rows, some of them have entered the meiotic prophase (arrows). In the medulla, primordial (small arrow head) and primary (large arrowhead) follicles are visible.